Grinding-machine.



J. G. ORAMER.

GRINDING MACHINE.

Patented Jan. 28, 1913 APPLICATION FILED JUNE 17,1912.

2 SHEETS-SHEET 1.

129mm f/ 4 J. O. CRAMER.

GRINDING MACHINE.

APPLICATION FILED JUNE 17, 1912.

1,051,695, Patented Jan. 28, 1913.

JOSEPH C. CBAMEB', 0F BOSEIBURG, OREGON.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Jan. 28, 1913.

Application filed June 17, 1912. Serial No. 704,157.

To all whom it may concern Be it known that I, Josnrn C. Cnamnn, a citizen of the United States, and a resident of Roseburg, in the county of Douglas and State of Oregon, have invented certain new and useful Improvements in Grinding Machines, of which the following is a speciflcation.

The invention relates particularly to grinding machines such as are employed in dress- .ing the channeled surface of grinding plates used in flour-mills.

It has for its object the provision of means whereby the cutting edges of the grinding surface" can be readily sharpened to meet the requirements.

The invention consists in the novel construction, combination and arrangement of parts hereinafter described, pointed out in the appended claims, and illustrated in the accompanying drawings.

In the drawings, in, which similar reference characters designate corresponding parts, Figure 1 I is a longitudinal vertical sectional view of a grinding machine embodying the invention. Fig. 2 is a transverse vertical sectional view. Fig. 3 is a lan View with grinding member removed. ig. 4 is a detail perspective view of the sliding carriage.

Pro ecting upwardly from the fourcorners of the base-plate 1 are the studs 2. Movably mounted on these studs, one on each side are the longitudinal guide-ways 3. Each guide-way has openings in its ends through which pass the studs 2 on that side. The-upward movement of the guide-way on the studs is limited by the disks 4 fastened to the tops of the studs. On each stud is a spiral spring 5 normally pressing the end of the guide-way upward against the disk. Movably mounted on the longitudinal guideways 3 is the carriage 6, extending transversely across the machine. This carriage comprises the end-pieces 7 and the cross-bars 8 rigidly joined together. On each end of the carriage is the downwardly projecting flange 9 outside of the guide-way 3 on that side. The flanges 9 extending over the outer edges of the guide-ways 3 hold the carriage to its path of travel along the longitudinal guide-ways 3. v

The tool for dressing the surfaces of the grinding plates comprises the abrasive wheel 10 fast on the spindle 11. The spindle is angular in cross-section, as at 12, and fits flanges 14 and 16.

a similarly shapedsocket in the hub of the wheel. The wheel is clamped in place on the spindle between he collars 13 secured to the spindle by set-screws. On the outer end of each collar is the flange 14. Adjacent to the flanged end of each collar is the roller 15 journaled on the spindle. The body of this roller is of less diameter than the flange 14, and on the outer end of the roller is the flange 16-of the same diameter as the flange 14. Journaled on the spindle outside of each roller is the handle 17, held in place by the disk 18 fast on the spindle. It is to be observed that the spindle is free to rotate in both the. roller 15 and the handle 17.

Each roller is adapted to travel on one of the cross-bars 8 of the movable carriage, and is held in its path of travel thereon by the g p The spindle is rotated by the flexible shaft 19 leading from a suitable source of power.

On the base-plate 1 are the clamping-rods 20 for holding the grinding plate 21 in place for the dressing operation. These clamping-rods extend diagonally across the baseplate so as to position the grinding plat? trave properly with relation to. the path 0 of the dressing tool. The inner edges of the clamping-rods are recessed, as at 22, to enage the corners of the inding hold the latter firmly in p ace. 'lhe clamping-rods are secured to the base-plate by the thumb-screws 23. By loosening'the thumbscrews the grinding plate can be readily removed and another placed in position for dressing.

The operation of the device is as follows: The egrinding plate 21 having been position and secured on the base-plate by the clamping-rods 20 and the spindle 11 put in rotation by the flexible shaft 19, the carriage 6 is moved to one end of the longitudinal guide-ways 3, and the grinding tool is moved to end of the carriage. The two handles 17 are gras ed by the operator and the tool is pressed ownward until the edge of the abrasive wheel 10 engages one of the channels in the grinding plate 21. When;

sides of plate to 5 on the v guide-ways 3 carrying the,

When one channel is completed, the pressure on the handles is lessened to permit the springs 5'to lift the carriage so that the abrasive wheel clears the channel. The carriage is then moved along the longitudinal guide-Ways 3 to position the abrasive wheel above another channel; The tool is then depressed into engagement with this chan- 1. In a grinding machine, a base-plate,

' clamping means'for holding the article to be ground on the base-plate, depressible guide-ways mounted on the base-plate, a carriage movable on the guide-ways, and a grinding tool adjustable on the carriage.

2. In a grinding machine, a base-plate, clamping means for holding the article to be ground on the base-plate, studs on the base-plate, longitudinal guide-Ways movable on the studs, sprlngs on the studs normally pressing the guide-ways upward from the base plate, a carriage movable on the guide- Ways, and a grinding tool adjustable on the carriage. A

3. In a grinding machine, a base-plate, clamping means for holding the article to be ground on the base-plate, depressible guide-ways longitudinally mounted on the base-plate, a carriage longitudinally movable on the guide-Ways, cross-bars on the carriage extending transversely of.- the guide-ways, and a grinding tool adjustable on the carriage along the cross-bars.

4. In a grinding machine, a base-plate, clamping means for holding the article to be ground on the base-plate, depressible guideways longitudinally mounted on the baseplate, a carriage longitudinally movable on the guide-ways, cross-bars on the carriage extending transversely of the, guide-ways, an abrasion wheel, a rotatable spindle carrying the abrasion wheel, rollers on the spindle to travel on the cross-bars of the carriage, and handles on the spindle.

In testimony whereof I hereunto-affix my "signature in the presence of two Witnesses.

JOSEPH C. CRAMER.

Witnesses:

W. W. ELDER, O

GRACE ELDER. 

